Motor Phase Failure Detection - Lenze i55AE125B Manual

8.7.5

Motor phase failure detection

The motor phase failure detection function can be activated for both synchronous and asyn-
chronous motors.
Preconditions
Phase failure detection during operation is basically only suitable for applications which are
operated with a constant load and speed. In other cases, transient processes or unfavourable
operating points can cause maloperation.
Details
If a current-carrying motor phase (U, V, W) fails during operation, the response selected in
0x2D45:001 (P310.01) is tripped. In case of setting "No response [0]", only an entry is made in
the logbook.
A motor phase failure can only be detected if
1. the rated motor current is higher than 10 % of the rated inverter current and
2. the output frequency is not lower than 0.1 Hz (standstill).
The lower the output frequency the longer the detection of the motor phase failure.
Parameter Name / value range / [default setting]
0x2D45:001 Motor phase failure detection: Response
(P310.01) (Mot.phase.fail.: Response)
0 No response
1 Warning
2 Trouble
3 Fault
0x2D45:002 Motor phase failure detection: Current threshold
(P310.02) (Mot.phase.fail.: Current thresh.)
1.0 ... [5.0] ... 25.0 %
0x2D45:003 Motor phase failure detection: Voltage threshold
(P310.03) (Mot.phase.fail.: Voltage thresh.)
0.0 ... [10.0] ... 100.0 V
Info
Selection of the response following the detection of a motor phase fail-
ure.
Associated error codes:
65289 | 0xFF09 - Motor phase missing
•
65290 | 0xFF0A - Phase U motor phase failure
•
65291 | 0xFF0B - Motor phase failure phase V
•
65292 | 0xFF0C - Motor phase failure phase W
•
4Error types
^ 139
Current threshold for the activation of the motor phase failure detection
function.
• 100 % ≡ Maximum current 0x2DDF:002
• Background: in order to be able to reliably detect the failure of a
motor phase, first a certain must flow for the current sensor system.
The detection function is therefore only activated if the actual value
of the motor current has exceeded the current threshold set here.
• Display of the present motor current in
Voltage threshold for motor phase monitoring.
• The monitoring function is triggered if the level of the motor current
is lower than the device-dependent threshold for longer than 20 ms.
• In case of V/f characteristic control, the voltage threshold is consid-
ered additionally for the motor phase failure detection. If the motor
voltage is higher than the voltage threshold, monitoring is combined
with the motor current.
Motor control
Motor protection
Motor phase failure detection
0x2D88 (P104.00).
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